Improvement in heating-stoves



w. BI TREADWELL. Hdating-Stuve.

NO.155,'685.' Patented Oct. 6,1874.

UNITED STATES.

PATENT OFFICE.

WILLIAM B. TREADWELL, on ALBANY, NEW YORK.

IMPROVEMENT IN.

HEATlNG-STOVES.

Specification forming part of Letters Patent N 0. 155,685., dated October 6, 1874; application filed June 14, 1873.

Stoves; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, wherein- Figure 1 represents a vertical section of my improved stove; Fig. 2, a horizontal section through the line 2 2, Fig. 1; Fig. 3, a similar section through the line y y; Fig. 4, a top view after the removal of the top plate; Fig.

' 5, a perspective view of the crescent-shaped air-heating flue.

This invention has relation to stoves for burning bituminous coal; and it consists in the construction and novel arrangement of the crescent-shaped air-heatin g flue, dividing the feeding-chamber from the combustionchamber, the tangential arrangement of the feeding-chamber, and the combustion-cham-. ber, said arrangement being extended upward by the smoke-flues to near the top of the stove,

and the vertically-divided air valve or registr, located toward the rear of the combus tionchamber, and of equal height therewith, all said parts being designed to afford, in a heater of ordinary size, such free and roomy passages for the admission of, and heating of,

atmospheric air, and for the escape of voluminous quantities of smoke, as the nature of the fuel for which the stove is designed requires.

The object, therefore, of this invention is to provide in a stove of the ordinary size, first, an air-flue of such free construction that it will convey to the combustion-chamber a voluminous current of air, heating it on its way to said chamber; second, combustion and smoke flues of large capacity to convey the quantities of the products of the combustion of bituminous coal; third, a feeding flue or chamber of sufficient size to readily receive the large lumps, in which form the soft coal is best fitted for handling and combustion, said lumps being readily broken up according to requirement in the capacious feed-chamber or combustion-chamber; fourth, in connection with the above features, an illuminated front to the combustion-chamber, all as hereinafter more fully described.

In the accompanying drawings, the letter A indicates the ash-pit; B, the fire-pot; O, the combustion-chamber; D,the fuel-door; G the feed or coal chamber; :12, the air-heating flue; E, the vertically-barred airregister; C the smoke-flue F, the exit-flue; and d, the damper at the top of the fuel-chamber. The front of the ash-pit is provided with a register-plate, o, to regulate or shut off the upward air-draft when desirable. In order that a large volume of air may be supplied to the grate when required, the front K is made removable. The grate G is arranged at the bottom of the firepot, which is made deep and capacious and upwardly-flaring. Usually I prefer to make the external wall of the fire-pot double, the external plate being perforated, and serving to prevent the too free radiation of heat. The grate is constructed in two portions, a horizontally-rotating annulus, c, notched'around its inner margin, and a central dumping-grate, Gr,'pivoted to bearings in said annulus, which rests in hooked supports f secured to the wall of the fire-pot. Above the fire-pot rises the combustion-chamber O, in the general form of a frustum of a cone, having at one side a rectangular projecting chamber, L, into which the air for oxygenizing purposes is first admitted through vertical slots 1 in its exterior or plane wall It. The height of this wall, and of the projecting air chamber which it bounds, is about equal to that of the conical wall of the combustion-chamber. To regulate the quantity of air admitted through the slots 1 a vertically-barred register-plateis provided. Above the combustion-chamber 0 extends upwardly the cylindrical wall R, bounding, externally, the smoke-flue G which is designed to be of large sectional capacity in view of the volume and density of the products of the combustion of bituminous "coal. Within the cylinder It, and eccentrically located at the side and rear thereof, is the feed-flue or coaling-chamber C the upper portion of which iscylindrical, and the lower portion or skirt a conical, flaring outclinatiou as the wall of the combustion-chamber to its terminal edge, a little below the middle horizontal plane y y of said combustionward and downward at the same angular inh 2 y 155,cs5 I chamber, although eccentric and connected with the wall of the combustion -chamber and the cylinder R, is not precisely tangen-I tial, the lines of connection being separated, in the lower or flaring portion, by that portion of the wall of the combustion-chamber which forms the inner wall of the inlet-airchamber L.

In the upper or cylindrical portion the lines of contact or connection are at'each side of a portion of the cylinder R, which is sufficiently wide to afford space for the large fuel-d oor D, which faces toward the rear of the stove.

Between the upper portion of the-combustion-chamber and the lower portion of the feedchamber is located the air-heatin g flue w. This is a horseshoe-shaped flue, bounded by the inner wall of the lower or flaring portion of the feedchamber and an outer flaring plate, 0. The upper portion of this downwardly-inclined flue is expanded, forming an enlarged annular chamber, as, which passes around the feedflue 0, except when the inner wall of the airchamber L is located, the ends of the chamber or flue as communicating with said air-chamber L at its upper corners. Below the enlargement as the air heating flue w is narrow between its walls, and the descending current of heated air is, by the construction, accelerated as it passes downward and into the coal.

The upper end-of the feed chamber is below the plane of the upper end of the cylinder R, and is provided with a top plate, d, through which an opening is formed for the reception of a damper-plate, d, having, at its edge, on opposite sides ofits journal-shaft, an

upper and an under flange, respectively arranged to engage with the upper and the under side of the top plate d.

The stove is crowned by a large cap, H, flaring outward from the cylinder R, its top rising conically from the circumference of the flaring portion, which joins the cylinder R, as shown in the drawings. In this mannera large and free passage, H, over the top of the fuelehamber, is provided for the smoke and products of combustion, which, passing upward from the combustion-chamber, through the crescent shaped flue C find an exit through the pipe F. g

Bituminous coal occurs in large pieces when brought from the mines, and is, preferably, burned in this condition, as it lasts longer,'and its voluminous and heavy products are more graduallyevolved during combustion. Moreover, choking or smothering the fire is not so liable to occur.

Thelarge fuel-door D enables these lumps to be readily fed into the stove, as well as broken up, when desirable, into smaller pieces, without letting out the smoke and ofl'ensive gases which are passing upward by way of the fiues O and H.

A volume of air is supplied to the combustion-chamber through a cold-air valve in the back of the stove, which passes downward through an expansion or inside chamber, which acts as a blower, and is discharged, highly heated, between approximated plates, into the midst of the burning coal, producing a powerful and excited combustion.

Having thus described the invention, what I claim, and desire to secure by Letters Patent, 1s

1. The combination, with the heating-case R, having fuel-opening D and the combustion-chamber wall extending downward and outward therefrom, of the eccentric coalingchamber 0', attached to said case B at each side of the fuel-door, and its downward extension, flaring at the same angle as the wall of the combustion-chamber, and attached thereto, substantially as specified.

2. The combination, with the combustionchamber 0 and the eccentric skirt of the fuelchamber 0 attached thereto in rear on the inside of the cold-air chamber L, attached to said combustion-chamber on the outside, and the air-heating flue x in said skirt, and communicating with the upper cornersof said chamber L, substantially as specified.

3. The combination, with the combustionchamber of a bituminous-coal stove, of the internal eccentric horseshoe-shaped skirt-flue w, .bounded by the descending parallel plates 0, and the expanded crown chamber as, communicating with an air-space external to said combustion-chamber,substantially as specified.

W. B. TREADWELL.

Witnesses:

EDW. A. DURANT, J r., ROBERT H. BULLooK. 

